Multiple Choice
In an experiment designed to test a hypothesis, how many experimental groups should you ideally have to ensure reliable results?
4. BONUS: Lab Techniques and Procedures
Experimental Error
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Why is it necessary to have positive and negative controls in an experiment?
A
To eliminate all sources of experimental error.
B
To validate the experimental results by providing a baseline for comparison.
C
To ensure the experiment is conducted under optimal conditions.
D
To increase the sample size and improve statistical significance.
Verified step by step guidance1
Understand the purpose of controls in an experiment: Controls are essential to validate the experimental results by providing a baseline for comparison.
Define a positive control: A positive control is a part of the experiment that is expected to produce a known response, confirming that the experimental setup can produce results.
Define a negative control: A negative control is a part of the experiment that is not expected to produce a response, ensuring that any observed effect is due to the experimental variable.
Explain the role of controls in eliminating experimental error: While controls do not eliminate all sources of error, they help identify whether the experimental setup is functioning as intended.
Discuss the importance of controls in validating results: By comparing the experimental results to the controls, researchers can determine if the observed effects are due to the experimental conditions or other factors.
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